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Unformatted text preview: Circadian Rhythms Require Both: Innate internal clock (clock genes!) Zeitgeber The major zeitgeber driving circadian processes is light. Pineal gland – triangular gland located in the top of the avian brain, detects light and produces the hormone melatonin. Superchiasmatic Nucleus (SCN) – pacemaker in the hypothalamus that controls the patterns of daily activities. Every cell in the body has an intrinsic rhythm. This is particularly important in the pineal gland, the eye, and the hypothalamus as they control much of the body’s activities both intrinsically and in response to darkness. Light can act in three places – the eye, the pineal, and an extraretinal/extrapineal receptor....
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- Spring '09
- Circadian Rhythms, Circadian rhythm, pineal gland, Circadian Rhythms Require, CIRDADIAN RHYTHMS Entrainment